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mojo/services/view_manager/view_manager_service_impl.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SERVICES_VIEW_MANAGER_VIEW_MANAGER_SERVICE_IMPL_H_
+#define SERVICES_VIEW_MANAGER_VIEW_MANAGER_SERVICE_IMPL_H_
+
+#include <set>
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/containers/hash_tables.h"
+#include "base/memory/scoped_ptr.h"
+#include "mojo/services/view_manager/access_policy_delegate.h"
+#include "mojo/services/view_manager/ids.h"
+#include "third_party/mojo_services/src/surfaces/public/interfaces/surface_id.mojom.h"
+#include "third_party/mojo_services/src/view_manager/public/interfaces/view_manager.mojom.h"
+
+namespace gfx {
+class Rect;
+}
+
+namespace view_manager {
+
+class AccessPolicy;
+class ConnectionManager;
+class ServerView;
+
+// An instance of ViewManagerServiceImpl is created for every ViewManagerService
+// request. ViewManagerServiceImpl tracks all the state and views created by a
+// client. ViewManagerServiceImpl coordinates with ConnectionManager to update
+// the client (and internal state) as necessary.
+class ViewManagerServiceImpl : public mojo::ViewManagerService,
+                               public AccessPolicyDelegate {
+ public:
+  using ViewIdSet = base::hash_set<mojo::Id>;
+
+  ViewManagerServiceImpl(ConnectionManager* connection_manager,
+                         mojo::ConnectionSpecificId creator_id,
+                         const std::string& creator_url,
+                         const std::string& url,
+                         const ViewId& root_id);
+  ~ViewManagerServiceImpl() override;
+
+  // |services| and |exposed_services| are the ServiceProviders to pass to the
+  // client via OnEmbed().
+  void Init(mojo::ViewManagerClient* client,
+            mojo::ViewManagerServicePtr service_ptr,
+            mojo::InterfaceRequest<mojo::ServiceProvider> services,
+            mojo::ServiceProviderPtr exposed_services);
+
+  mojo::ConnectionSpecificId id() const { return id_; }
+  mojo::ConnectionSpecificId creator_id() const { return creator_id_; }
+  const std::string& url() const { return url_; }
+
+  mojo::ViewManagerClient* client() { return client_; }
+
+  // Returns the View with the specified id.
+  ServerView* GetView(const ViewId& id) {
+    return const_cast<ServerView*>(
+        const_cast<const ViewManagerServiceImpl*>(this)->GetView(id));
+  }
+  const ServerView* GetView(const ViewId& id) const;
+
+  // Returns true if this connection's root is |id|.
+  bool IsRoot(const ViewId& id) const;
+
+  // Returns the id of the root node. This is null if the root has been
+  // destroyed but the connection is still valid.
+  const ViewId* root() const { return root_.get(); }
+
+  // Invoked when a connection is about to be destroyed.
+  void OnWillDestroyViewManagerServiceImpl(ViewManagerServiceImpl* connection);
+
+  // These functions are synchronous variants of those defined in the mojom. The
+  // ViewManagerService implementations all call into these. See the mojom for
+  // details.
+  mojo::ErrorCode CreateView(const ViewId& view_id);
+  bool AddView(const ViewId& parent_id, const ViewId& child_id);
+  std::vector<const ServerView*> GetViewTree(const ViewId& view_id) const;
+  bool SetViewVisibility(const ViewId& view_id, bool visible);
+  bool EmbedUrl(const std::string& url,
+                const ViewId& view_id,
+                mojo::InterfaceRequest<mojo::ServiceProvider> services,
+                mojo::ServiceProviderPtr exposed_services);
+  bool Embed(const ViewId& view_id, mojo::ViewManagerClientPtr client);
+
+  // The following methods are invoked after the corresponding change has been
+  // processed. They do the appropriate bookkeeping and update the client as
+  // necessary.
+  void ProcessViewBoundsChanged(const ServerView* view,
+                                const gfx::Rect& old_bounds,
+                                const gfx::Rect& new_bounds,
+                                bool originated_change);
+  void ProcessViewportMetricsChanged(const mojo::ViewportMetrics& old_metrics,
+                                     const mojo::ViewportMetrics& new_metrics,
+                                     bool originated_change);
+  void ProcessWillChangeViewHierarchy(const ServerView* view,
+                                      const ServerView* new_parent,
+                                      const ServerView* old_parent,
+                                      bool originated_change);
+  void ProcessViewPropertyChanged(const ServerView* view,
+                                  const std::string& name,
+                                  const std::vector<uint8_t>* new_data,
+                                  bool originated_change);
+  void ProcessViewHierarchyChanged(const ServerView* view,
+                                   const ServerView* new_parent,
+                                   const ServerView* old_parent,
+                                   bool originated_change);
+  void ProcessViewReorder(const ServerView* view,
+                          const ServerView* relative_view,
+                          mojo::OrderDirection direction,
+                          bool originated_change);
+  void ProcessViewDeleted(const ViewId& view, bool originated_change);
+  void ProcessWillChangeViewVisibility(const ServerView* view,
+                                       bool originated_change);
+  void ProcessViewPropertiesChanged(const ServerView* view,
+                                    bool originated_change);
+
+ private:
+  typedef std::map<mojo::ConnectionSpecificId, ServerView*> ViewMap;
+
+  bool IsViewKnown(const ServerView* view) const;
+
+  // These functions return true if the corresponding mojom function is allowed
+  // for this connection.
+  bool CanReorderView(const ServerView* view,
+                      const ServerView* relative_view,
+                      mojo::OrderDirection direction) const;
+
+  // Deletes a view owned by this connection. Returns true on success. |source|
+  // is the connection that originated the change.
+  bool DeleteViewImpl(ViewManagerServiceImpl* source, ServerView* view);
+
+  // If |view| is known (in |known_views_|) does nothing. Otherwise adds |view|
+  // to |views|, marks |view| as known and recurses.
+  void GetUnknownViewsFrom(const ServerView* view,
+                           std::vector<const ServerView*>* views);
+
+  // Removes |view| and all its descendants from |known_views_|. This does not
+  // recurse through views that were created by this connection. All views owned
+  // by this connection are added to |local_views|.
+  void RemoveFromKnown(const ServerView* view,
+                       std::vector<ServerView*>* local_views);
+
+  // Resets the root of this connection.
+  void RemoveRoot();
+
+  void RemoveChildrenAsPartOfEmbed(const ViewId& view_id);
+
+  // Converts View(s) to ViewData(s) for transport. This assumes all the views
+  // are valid for the client. The parent of views the client is not allowed to
+  // see are set to NULL (in the returned ViewData(s)).
+  mojo::Array<mojo::ViewDataPtr> ViewsToViewDatas(
+      const std::vector<const ServerView*>& views);
+  mojo::ViewDataPtr ViewToViewData(const ServerView* view);
+
+  // Implementation of GetViewTree(). Adds |view| to |views| and recurses if
+  // CanDescendIntoViewForViewTree() returns true.
+  void GetViewTreeImpl(const ServerView* view,
+                       std::vector<const ServerView*>* views) const;
+
+  // Notify the client if the drawn state of any of the roots changes.
+  // |view| is the view that is changing to the drawn state |new_drawn_value|.
+  void NotifyDrawnStateChanged(const ServerView* view, bool new_drawn_value);
+
+  // Deletes all Views we own.
+  void DestroyViews();
+
+  bool PrepareForEmbed(const ViewId& view_id);
+
+  // ViewManagerService:
+  void CreateView(
+      mojo::Id transport_view_id,
+      const mojo::Callback<void(mojo::ErrorCode)>& callback) override;
+  void DeleteView(mojo::Id transport_view_id,
+                  const mojo::Callback<void(bool)>& callback) override;
+  void AddView(mojo::Id parent_id,
+               mojo::Id child_id,
+               const mojo::Callback<void(bool)>& callback) override;
+  void RemoveViewFromParent(
+      mojo::Id view_id,
+      const mojo::Callback<void(bool)>& callback) override;
+  void ReorderView(mojo::Id view_id,
+                   mojo::Id relative_view_id,
+                   mojo::OrderDirection direction,
+                   const mojo::Callback<void(bool)>& callback) override;
+  void GetViewTree(mojo::Id view_id,
+                   const mojo::Callback<void(mojo::Array<mojo::ViewDataPtr>)>&
+                       callback) override;
+  void SetViewSurfaceId(mojo::Id view_id,
+                        mojo::SurfaceIdPtr surface_id,
+                        const mojo::Callback<void(bool)>& callback) override;
+  void SetViewBounds(mojo::Id view_id,
+                     mojo::RectPtr bounds,
+                     const mojo::Callback<void(bool)>& callback) override;
+  void SetViewVisibility(mojo::Id view_id,
+                         bool visible,
+                         const mojo::Callback<void(bool)>& callback) override;
+  void SetViewProperty(mojo::Id view_id,
+                       const mojo::String& name,
+                       mojo::Array<uint8_t> value,
+                       const mojo::Callback<void(bool)>& callback) override;
+  void EmbedUrl(const mojo::String& url,
+                mojo::Id transport_view_id,
+                mojo::InterfaceRequest<mojo::ServiceProvider> services,
+                mojo::ServiceProviderPtr exposed_services,
+                const mojo::Callback<void(bool)>& callback) override;
+  void Embed(mojo::Id transport_view_id,
+             mojo::ViewManagerClientPtr client,
+             const mojo::Callback<void(bool)>& callback) override;
+  void PerformAction(mojo::Id transport_view_id,
+                     const mojo::String& action,
+                     const mojo::Callback<void(bool)>& callback) override;
+
+  // AccessPolicyDelegate:
+  bool IsRootForAccessPolicy(const ViewId& id) const override;
+  bool IsViewKnownForAccessPolicy(const ServerView* view) const override;
+  bool IsViewRootOfAnotherConnectionForAccessPolicy(
+      const ServerView* view) const override;
+
+  ConnectionManager* connection_manager_;
+
+  // Id of this connection as assigned by ConnectionManager.
+  const mojo::ConnectionSpecificId id_;
+
+  // URL this connection was created for.
+  const std::string url_;
+
+  // ID of the connection that created us. If 0 it indicates either we were
+  // created by the root, or the connection that created us has been destroyed.
+  mojo::ConnectionSpecificId creator_id_;
+
+  // The URL of the app that embedded the app this connection was created for.
+  // NOTE: this is empty if the connection was created by way of directly
+  // supplying the ViewManagerClient.
+  const std::string creator_url_;
+
+  mojo::ViewManagerClient* client_;
+
+  scoped_ptr<AccessPolicy> access_policy_;
+
+  // The views created by this connection. This connection owns these objects.
+  ViewMap view_map_;
+
+  // The set of views that has been communicated to the client.
+  ViewIdSet known_views_;
+
+  // The root of this connection. This is a scoped_ptr to reinforce the
+  // connection may have no root. A connection has no root if either the root
+  // is destroyed or Embed() is invoked on the root.
+  scoped_ptr<ViewId> root_;
+
+  DISALLOW_COPY_AND_ASSIGN(ViewManagerServiceImpl);
+};
+
+}  // namespace view_manager
+
+#endif  // SERVICES_VIEW_MANAGER_VIEW_MANAGER_SERVICE_IMPL_H_